Picopulse optical fiber laser

Abstract

The invention discloses a picosecond pulse optical fibre laser which comprises a main cavity resonator and an outer cavity feedback part. A semiconductor laser is adopted as a pumping source; a dichroic mirror and double envelope optical fibre mixing with ytterbium form the main cavity resonator which is coupled to an outer cavity through a collimating lens; a acoustooptic modulator AOM in the outer cavity adopts Raman-Nath diffraction; and a blazed grating outputs zero-level diffraction light generated by a signal light and feeds back any level light in high-level light to the cavity resonator. The invention has simple structure and high cost performance, can realize wide-tune, narrow-line-width and stable picosecond pulse laser output and can be widely applied to the fields of laser processing, laser medical treatment, laser marking, seed light source, etc.

Description

technical field

[0001] The invention relates to a laser technology, in particular to a picosecond pulse fiber laser. Background technique

[0002] Picosecond (ps) pulsed Ytterbium-doped double-clad fiber lasers with wide tuning and narrow linewidth have great application value in laser processing, seed light sources for terahertz waves and femtosecond lasers, etc. Picosecond pulsed fiber lasers have incomparable advantages such as low threshold, low noise, high signal-to-noise ratio, miniaturization, and no need for refrigeration. Femtosecond laser seed source is a very attractive source.

[0003] Among the picosecond pulsed fiber lasers in the prior art, one is an actively mode-locked fiber laser, and the AOM (acousto-optic modulator) uses Bragg (Bragg) diffraction. At this time, only zero-order light and one-order light appear after AOM diffraction. The first-order light is fed back into the cavity through the grating, and the zero-order light is output.

[0004] The ab...

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